package com.hmdp.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.Result;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.IVoucherOrderService;
import com.hmdp.utils.RedisIdWorker;
import com.hmdp.utils.SimpleRedisLock;
import com.hmdp.utils.UserHolder;
import org.springframework.aop.framework.AopContext;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.time.LocalDateTime;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */

@Service
public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {
@Resource
  private SeckillVoucherServiceImpl seckillVoucherServiceImpl;
@Resource
  private RedisIdWorker redisIdWorker;
@Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result seckillVoucher(Long voucherId) {
        //1.查询秒杀券
        SeckillVoucher seckillVoucher = seckillVoucherServiceImpl.getById(voucherId);
        //2.判断秒杀是否开始
        if (seckillVoucher.getBeginTime().isAfter(LocalDateTime.now())) {
            return Result.fail("秒杀未开始");
        }
        //3.判断秒杀是否结束
        if (seckillVoucher.getEndTime().isBefore(LocalDateTime.now())) {
            return Result.fail("秒杀已结束");
        }
        //4.判断库存是否充足
        if (seckillVoucher.getStock() < 1) {
            return Result.fail("库存不足");
        }
        Long userId = UserHolder.getUser().getId();
        //创建分布式锁对象
        SimpleRedisLock lock = new SimpleRedisLock(stringRedisTemplate, "order:" + userId);
        //5.获取锁
        boolean isLock = lock.tryLock(1200);
        if (!isLock) {
            //获取锁失败，返回错误信息
            return Result.fail("不允许重复下单");
        }
        try {
            //获取代理对象
            IVoucherOrderService proxy = (IVoucherOrderService) AopContext.currentProxy();
            return proxy.createVoucherOrder(voucherId);

        }finally {
            //释放锁
            lock.unlock();
        }

    }
@Transactional
public Result createVoucherOrder(Long voucherId) {
    //一人一单
    Long userId = UserHolder.getUser().getId();

        //5.查询订单
        int count = query().eq("user_id", userId).eq("voucher_id", voucherId).count();
        if (count > 0) {
            return Result.fail("用户已购买");
        }
        //5.扣减库存
        //Lambda写法
//        LambdaUpdateWrapper <SeckillVoucher> updateWrapper = new LambdaUpdateWrapper<>();
//        updateWrapper.setSql("stock=stock-1").eq(SeckillVoucher::getVoucherId, voucherId)
//                .eq(SeckillVoucher::getStock, seckillVoucher.getStock());;
//         boolean success=seckillVoucherServiceImpl.update(updateWrapper);
        //5.1乐观锁
        boolean success = seckillVoucherServiceImpl.update()
                .setSql("stock=stock-1")
                .eq("voucher_id", voucherId)
                .gt("stock", 0)
                .update();
        if (!success) {
            return Result.fail("库存不足");
        }
        //6.创建订单
        VoucherOrder voucherOrder = new VoucherOrder();
        //6.1订单id
        long orderId = redisIdWorker.nextId("order");
        voucherOrder.setId(orderId);
        //6.2用户id
        voucherOrder.setUserId(userId);
        //6.3代金券id
        voucherOrder.setVoucherId(voucherId);
        save(voucherOrder);

        return Result.ok(orderId);

}
}
